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81. The ball weighing m = 100 g, attached to the end of the thread length ℓ1 = 1 m revolves, based on a horizontal plane at a frequency n1 = 1 s-1. The thread is shortened, and the ball is close to the axis of rotation to a distance ℓ2 = 0,5 m. With what frequency n2 will then rotate the ball? And what kind of work will make the external force, shortening the thread? Friction ball on the plane ignored.

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